To Troubleshoot T1 CAS, T1 PRI, and E1 Ports That Do Not Answer

Verify that the span is up by using the spanstat command. If the trunks show no alarms, then the PBX or Telco routing may not be set up correctly or the trunks may be in a lockout state. This is an issue with the PBX or Telco and not with Cisco Unified MeetingPlace.

Use spanstat span_number -all to verify that calls are being presented to the Cisco Unified MeetingPlace system. For T1 CAS, the AB bits change state when a caller dials into the system. For T1 PRI and E1, the call state changes when a caller dials into the system.

A proper incoming call should follow this sequence:

"ds" (incoming call) => "ii" (call active) => ".." (port idle)

A proper outgoing call should follow this sequence:

"sd" (outgoing call) => "oo" (call active) => ".." (port idle)

Note: If a "ds" => ".." or "sd" => ".." transition occurs quickly, this indicates that the near-end or far-end, respectively, is rejecting the call. Verify that the port is active on the Cisco Unified MeetingPlace side (near-end) and that the ISDN service is activated on the far-end. Contact Cisco TAC for information on determining the ISDN cause code for the call rejection.

Note: If a port stays in any of these states for more than ten seconds, this indicates a possible protocol problem where one side is not clearing down the telephone call all of the way ("do," "di," "od," or "id"). If this is the case, contact Cisco TAC to determine if ISDN messages are being lost.

Look for errors on the span by using the spanstat -s command.

Verify the correct cabling, as this is frequently reversed:

pin 1 - MP Receive (tip)

pin 2 - MP Receive (ring)

pin 4 - MP Send (tip)

pin 5 - MP Send (ring)

Note: Use a loopback plug to show that the physical ports are serviceable. This lets you move beyond the Cisco Unified MeetingPlace Audio Server and into the carrier for problem analysis.

Verify the configuration with the blade command.

Check the framing (ESF or D4) and coding (B8ZS or jammed-bit).

Check the LEDs on the front of the Cisco Unified MeetingPlace Audio Server, as follows:

For Cisco Unified MeetingPlace 8112, ensure that the system in service LED light is green.

For Cisco Unified MeetingPlace 8106 and Cisco Unified MeetingPlace 8112, ensure that the lights for all active T1 Smart Blades are green.

At the tech$ prompt, enter port . The following port command menu appears:

meetingplace:tech$ port

***** P O R T / G R O U P C O N F I G M E N U *****

1) View port record(s)

2) Modify port record

3) Copy port records

4) View group record(s)

5) Modify group record

x) Exit program

Enter command: 4

View the port group record by entering 4 . The second line in the following example appears:

Enter command: 4

Enter port group record number [0..31, <cr> for all] : 0

------------ GROUP 0 ---------------

Activate the group? : y

Card type : E1

Signaling : Euro ISDN

Protocol table : 50

Number of DID digits : 0

Human assistance? : n

Flash transfer? : n

Outdial? : y

Enter command: x

Enter the appropriate port group number. In the preceding example, it is 0, so enter 0 . The rest of the preceding example appears.

Note the protocol table number. In this example, it is protocol table 50.

Exit the port command by entering x .

Enter protparm . The following example appears:

meetingplace:tech$ protparm

***** P R O T P A R M C O N F I G M E N U *****

1) View protocol parameter table(s)

2) Modify protocol parameter table

3) Copy protocol table

4) Delete protocol table(s)

x) Exit program

Enter command: 1

View the protocol parameter table by entering 1 . The second line in the following example appears:

Enter command: 1

Enter protocol table number [0..99, <cr> for all] : 50

***** V I E W M E N U *****

1) View entire table

2) View general information

3) View incoming called party number processing (DDI)

4) View incoming calling party number processing (CLI)

5) View outgoing calling party information

6) View outgoing called party type of number (TON)

7) View outgoing called party numbering plan (NPI)

8) View outgoing private number definition

9) View outgoing local number definition

a) View outgoing long distance number definition

b) View outgoing international number definition

c) View outgoing Network Specific Facilities (NSF) codes

d) View outgoing NSF Carrier Identification Code (CIC)

x) Exit to main menu

Enter list command [table 50]: 2

Enter the number of the appropriate protocol table (found in Step 5). In this example, it is 50, so enter 50 . The rest of the preceding example appears.

View the general information by entering 2 . A screen similar to the following appears:

Enter list command [table 50]: 2

----------------- PROTOCOL TABLE 50 ---------------

Activate the table? : y

Description : Euro-ISDN generic table for Europe

Protocol : Euro ISDN

CAS signaling table filename : (none)

Default clearing cause : 16 (normal clearing)

B-channel negotiation : exclusive

Protocol side : user

Enter list command [table 50]: 0

Verify that the protocol table has the correct parameters set. If it does not, change it as necessary by going to the main protparm command menu (by entering x ) and selecting the modify protocol parameter table option (by entering 2 ).

Note: You cannot modify protocol tables 0 to 49 because they are read-only. If you need to change these tables, copy one of the read-only tables and then modify your copy of the table.

Exit the protparm command by entering x .

To Troubleshoot When You Cannot Outdial on T1 CAS, T1 PRI, or E1 Ports

Verify that the port and port group are configured for outdial by using the port command. Follow these steps: